P-55: A LCD Supplied by High Integrated Dual-Side Dual-Output Switched-Capacitor Regulator with Only Two Flying Capacitors

This paper presents a high integrated dual‐side dual‐output (DSDO) switched‐capacitor (SC) regulator with only two flying capacitors. Generally, a dual‐phase voltage doubler and an inverter are used to supply positive and negative voltage for TFT‐LCD gate drivers, respectively. Four flying capacitors, eight pin‐outs, and sixteen power switches are necessary for their operations in the driver integrated chip (IC). The proposed DSDO SC regulator combines both dual‐phase voltage doubler and inverter converter into one channel through the use of time multiplexing technique at the cost of little performance degradation. As a result, it not only diminishes the number of flying capacitor from four to two but also removes four IC pin‐outs for low cost and compact size. Beside, sixteen necessary power switches are reduced to twelve for decreasing about 27% silicon area.